RE: [EXT] [PATCH v2 3/3] mtd: rawnand: micron: Address the shallow erase issue

["Bean Huo (beanhuo)" <beanhuo@xxxxxxxxxx>]

Hi, Richard

> > > > > +	}
> > > >
> > > >
> > > > Here, if the power loss happens before erasing this block, for the
> > > > next time boot up, What will happen from FS layer in case FS
> > > > detect this filled
> > > data?
> > >
> > > Most likely ECC errors will be returned, but that doesn't matter
> > > since this block was about to be erased. You have pretty much the
> > > same problem for partially erase blocks already, and that should be
> > > handled by the wear-leveling/FS, if not, that would be bug (note
> > > that it's properly handled by UBI, which just considers the block as invalid and
> schedules an erase).
> > >
> >
> > Concerning this, I still have question, for the UBIFS,  If I am
> > correct, there are EC and VID header both being damaged, then UBIFS
> > will re-erase it. I don't know if UBIFS can handle there is dirty/filling data in the
> some pages  and EC/VID valid.
> > Maybe Richard has fixed it.
> 
> If the block is being erased that means there's another one mapped to the same
> LEB, or the block is simply not needed anymore. In both cases, this old block
> shouldn't be referenced. Again, if that happens, it's a bug.

Would you please help us confirm this?  how does ubifs handle this situation? Also other FS? Eg, jffs2, yaffs

Thanks,

Bean

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